|Model name|Length|Width|Height|Riders|Capacity|Description|Portable|Notes|
|---|---|---|---|---|---|---|---|---|
|Skater|21.5 m (71 ft)|11.65 m (38.2 ft)|10.69 m (35.1 ft)|24|600|Small halfpipe with inwards-facing seats.|Yes||
|Disk'O|24.55 m (80.5 ft)|9.68 m (31.8 ft)|10 m (33 ft)|24|600|Small halfpipe with outwards-facing seats.|Yes||
|Surf's Up|29 m (95 ft)|11 m (36 ft)|7.5 m (25 ft)|20|480|Small halfpipe with hill in middle. Guests stand on rectangular platform.|Yes||
|Mega Disk'O|37.5 m (123 ft)|10 m (33 ft)|15.5 m (51 ft)|24|600|Large halfpipe with outwards-facing seats.|No||
|Mega Disk'O|37.5 m (123 ft)|10 m (33 ft)|15.5 m (51 ft)|40|1000|Large halfpipe with outwards-facing seats.|No||
|Skater Coaster|Unknown|Unknown|Unknown|Unknown|Unknown|Large halfpipe with hill in middle. Inwards-facing seats.|Unknown|N/A|
|Disk'O Coaster|81.5 m (267 ft)|11.3 m (37 ft)|15.5 m (51 ft)|24|500|Large halfpipe with hill in middle. Outwards-facing seats.|No||
|Disk'O Coaster|81.5 m (267 ft)|11.3 m (37 ft)|15.5 m (51 ft)|40|600|Large halfpipe with hill in middle. Outwards-facing seats.|No||

Question: how many rides are portable?
Answer: 3